cli: set click_types.Path for -r and -e options (#5352)

* cli: set click_types.Path for -r and -e options

this enables click to generate shell auto completions for files/paths
see #3478

* added news fragment for PR 5352

Author: exploide

news/5352.trivial.rst

@@ -0,0 +1 @@
+emit file-based shell completions for -r and -e options

pipenv/cli/options.py

@@ -127,7 +127,7 @@ def callback(ctx, param, value):
         expose_value=False,
         multiple=True,
         callback=callback,
-        type=click_types.STRING,
+        type=click_types.Path(file_okay=False),
         help="An editable Python package URL or path, often to a VCS repository.",
     )(f)
 
@@ -460,7 +460,7 @@ def callback(ctx, param, value):
         expose_value=False,
         help="Import a requirements.txt file.",
         callback=callback,
-        type=click_types.STRING,
+        type=click_types.Path(dir_okay=False),
     )(f)